What is the most common research method for answering the "nature-versus-nurture" question about the contributions of genetics and the environment to personality development?

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A twin study involves comparing the similarities of identical twins (who share 100% of their genes) and fraternal twins (who share an average of 50% of their genes) to determine the relative contributions of genetics and the environment to a particular trait, such as personality. This method allows researchers to estimate the heritability (proportion of variance in a trait that can be attributed to genetics) of a trait, and is widely considered the best method for studying the nature-versus-nurture question in psychology.

What Is the Most Common Research Method for Answering the "Nature-Versus-Nurture